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kernel: drop usbdev LED trigger

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It was LEDE's trigger that was replaced by upstream usbport one.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki
2016-10-19 12:09:45 +02:00
parent 0658527e1e
commit d0b50c2770
10 changed files with 5 additions and 488 deletions
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371
target/linux/generic/files/drivers/leds/ledtrig-usbdev.c
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@@ -1,371 +0,0 @@
/*
* LED USB device Trigger
*
* Toggles the LED to reflect the presence and activity of an USB device
* Copyright (C) Gabor Juhos <juhosg@openwrt.org>
*
* derived from ledtrig-netdev.c:
* Copyright 2007 Oliver Jowett <oliver@opencloud.com>
*
* ledtrig-netdev.c derived from ledtrig-timer.c:
* Copyright 2005-2006 Openedhand Ltd.
* Author: Richard Purdie <rpurdie@openedhand.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/timer.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <linux/usb.h>
#include "leds.h"
#define DEV_BUS_ID_SIZE 32
/*
* Configurable sysfs attributes:
*
* device_name - name of the USB device to monitor
* activity_interval - duration of LED blink, in milliseconds
*/
struct usbdev_trig_data {
rwlock_t lock;
struct timer_list timer;
struct notifier_block notifier;
struct led_classdev *led_cdev;
struct usb_device *usb_dev;
char device_name[DEV_BUS_ID_SIZE];
unsigned interval;
int last_urbnum;
};
static void usbdev_trig_update_state(struct usbdev_trig_data *td)
{
if (td->usb_dev)
led_set_brightness(td->led_cdev, LED_FULL);
else
led_set_brightness(td->led_cdev, LED_OFF);
if (td->interval && td->usb_dev)
mod_timer(&td->timer, jiffies + td->interval);
else
del_timer(&td->timer);
}
static ssize_t usbdev_trig_name_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct usbdev_trig_data *td = led_cdev->trigger_data;
read_lock(&td->lock);
sprintf(buf, "%s\n", td->device_name);
read_unlock(&td->lock);
return strlen(buf) + 1;
}
struct usbdev_trig_match {
char *device_name;
struct usb_device *usb_dev;
};
static int usbdev_trig_find_usb_dev(struct usb_device *usb_dev, void *data)
{
struct usbdev_trig_match *match = data;
if (strcmp(dev_name(&usb_dev->dev), match->device_name) != 0)
return 0;
if (WARN_ON(match->usb_dev))
return 0;
dev_dbg(&usb_dev->dev, "matched this device!\n");
match->usb_dev = usb_get_dev(usb_dev);
return 0;
}
static ssize_t usbdev_trig_name_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t size)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct usbdev_trig_data *td = led_cdev->trigger_data;
if (size < 0 || size >= DEV_BUS_ID_SIZE)
return -EINVAL;
write_lock(&td->lock);
strcpy(td->device_name, buf);
if (size > 0 && td->device_name[size - 1] == '\n')
td->device_name[size - 1] = 0;
if (td->device_name[0] != 0) {
struct usbdev_trig_match match = {
.device_name = td->device_name,
};
/* check for existing device to update from */
usb_for_each_dev(&match, usbdev_trig_find_usb_dev);
if (match.usb_dev) {
if (td->usb_dev)
usb_put_dev(td->usb_dev);
td->usb_dev = match.usb_dev;
td->last_urbnum = atomic_read(&match.usb_dev->urbnum);
}
/* updates LEDs, may start timers */
usbdev_trig_update_state(td);
}
write_unlock(&td->lock);
return size;
}
static DEVICE_ATTR(device_name, 0644, usbdev_trig_name_show,
usbdev_trig_name_store);
static ssize_t usbdev_trig_interval_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct usbdev_trig_data *td = led_cdev->trigger_data;
read_lock(&td->lock);
sprintf(buf, "%u\n", jiffies_to_msecs(td->interval));
read_unlock(&td->lock);
return strlen(buf) + 1;
}
static ssize_t usbdev_trig_interval_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t size)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct usbdev_trig_data *td = led_cdev->trigger_data;
int ret = -EINVAL;
char *after;
unsigned long value = simple_strtoul(buf, &after, 10);
size_t count = after - buf;
if (*after && isspace(*after))
count++;
if (count == size && value <= 10000) {
write_lock(&td->lock);
td->interval = msecs_to_jiffies(value);
usbdev_trig_update_state(td); /* resets timer */
write_unlock(&td->lock);
ret = count;
}
return ret;
}
static DEVICE_ATTR(activity_interval, 0644, usbdev_trig_interval_show,
usbdev_trig_interval_store);
static int usbdev_trig_notify(struct notifier_block *nb,
unsigned long evt,
void *data)
{
struct usb_device *usb_dev;
struct usbdev_trig_data *td;
if (evt != USB_DEVICE_ADD && evt != USB_DEVICE_REMOVE)
return NOTIFY_DONE;
usb_dev = data;
td = container_of(nb, struct usbdev_trig_data, notifier);
write_lock(&td->lock);
if (strcmp(dev_name(&usb_dev->dev), td->device_name))
goto done;
if (evt == USB_DEVICE_ADD) {
usb_get_dev(usb_dev);
if (td->usb_dev != NULL)
usb_put_dev(td->usb_dev);
td->usb_dev = usb_dev;
td->last_urbnum = atomic_read(&usb_dev->urbnum);
} else if (evt == USB_DEVICE_REMOVE) {
if (td->usb_dev != NULL) {
usb_put_dev(td->usb_dev);
td->usb_dev = NULL;
}
}
usbdev_trig_update_state(td);
done:
write_unlock(&td->lock);
return NOTIFY_DONE;
}
/* here's the real work! */
static void usbdev_trig_timer(unsigned long arg)
{
struct usbdev_trig_data *td = (struct usbdev_trig_data *)arg;
int new_urbnum;
write_lock(&td->lock);
if (!td->usb_dev || td->interval == 0) {
/*
* we don't need to do timer work, just reflect device presence
*/
if (td->usb_dev)
led_set_brightness(td->led_cdev, LED_FULL);
else
led_set_brightness(td->led_cdev, LED_OFF);
goto no_restart;
}
if (td->interval)
new_urbnum = atomic_read(&td->usb_dev->urbnum);
else
new_urbnum = 0;
if (td->usb_dev) {
/*
* Base state is ON (device is present). If there's no device,
* we don't get this far and the LED is off.
* OFF -> ON always
* ON -> OFF on activity
*/
if (td->led_cdev->brightness == LED_OFF)
led_set_brightness(td->led_cdev, LED_FULL);
else if (td->last_urbnum != new_urbnum)
led_set_brightness(td->led_cdev, LED_OFF);
} else {
/*
* base state is OFF
* ON -> OFF always
* OFF -> ON on activity
*/
if (td->led_cdev->brightness == LED_FULL)
led_set_brightness(td->led_cdev, LED_OFF);
else if (td->last_urbnum != new_urbnum)
led_set_brightness(td->led_cdev, LED_FULL);
}
td->last_urbnum = new_urbnum;
mod_timer(&td->timer, jiffies + td->interval);
no_restart:
write_unlock(&td->lock);
}
static void usbdev_trig_activate(struct led_classdev *led_cdev)
{
struct usbdev_trig_data *td;
int rc;
td = kzalloc(sizeof(struct usbdev_trig_data), GFP_KERNEL);
if (!td)
return;
rwlock_init(&td->lock);
td->notifier.notifier_call = usbdev_trig_notify;
td->notifier.priority = 10;
setup_timer(&td->timer, usbdev_trig_timer, (unsigned long) td);
td->led_cdev = led_cdev;
td->interval = msecs_to_jiffies(50);
led_cdev->trigger_data = td;
rc = device_create_file(led_cdev->dev, &dev_attr_device_name);
if (rc)
goto err_out;
rc = device_create_file(led_cdev->dev, &dev_attr_activity_interval);
if (rc)
goto err_out_device_name;
usb_register_notify(&td->notifier);
return;
err_out_device_name:
device_remove_file(led_cdev->dev, &dev_attr_device_name);
err_out:
led_cdev->trigger_data = NULL;
kfree(td);
}
static void usbdev_trig_deactivate(struct led_classdev *led_cdev)
{
struct usbdev_trig_data *td = led_cdev->trigger_data;
if (td) {
usb_unregister_notify(&td->notifier);
device_remove_file(led_cdev->dev, &dev_attr_device_name);
device_remove_file(led_cdev->dev, &dev_attr_activity_interval);
write_lock(&td->lock);
if (td->usb_dev) {
usb_put_dev(td->usb_dev);
td->usb_dev = NULL;
}
write_unlock(&td->lock);
del_timer_sync(&td->timer);
kfree(td);
}
}
static struct led_trigger usbdev_led_trigger = {
.name = "usbdev",
.activate = usbdev_trig_activate,
.deactivate = usbdev_trig_deactivate,
};
static int __init usbdev_trig_init(void)
{
return led_trigger_register(&usbdev_led_trigger);
}
static void __exit usbdev_trig_exit(void)
{
led_trigger_unregister(&usbdev_led_trigger);
}
module_init(usbdev_trig_init);
module_exit(usbdev_trig_exit);
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_DESCRIPTION("USB device LED trigger");
MODULE_LICENSE("GPL v2");